Fluux XMPP client example for Fluux XMPP v0.0.1

AppDelegate.swift

//
//  AppDelegate.swift
//  XMPPClientTest
//
//  Created by Mickaël Rémond on 21/11/2018.
//  Copyright © 2018 ProcessOne. All rights reserved.
//

import UIKit
import CoreData
import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
    var myClient: MyClient?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        // Ask user authorization for push notification.
        UNUserNotificationCenter.current().requestAuthorization(options: [
            .badge, .sound, .alert
        ]) { granted, _ in
            guard granted else { return }
            DispatchQueue.main.async {
                application.registerForRemoteNotifications()
            }
        }
        
        return true
    }
    
    // Get device token.
    func application(_ application: UIApplication,
                     didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        let token = deviceToken.reduce("") { $0 + String(format: "%02x", $1) }
        print(token)
        
        // TODO Fix me: Currently, client will not work if push is not enabled
        // Connect XMPP client through my wrapper class
        myClient = MyClient(jid: "mremond@localhost/sdk", token: token)
    }
    
    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
        print("Could not register token: \(error)")
        // Connect XMPP client through my wrapper class
        myClient = MyClient(jid: "mremond@localhost/sdk")
    }

    func applicationWillResignActive(_ application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
        myClient?.client?.enterBackground()
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
        myClient?.client?.enterForeground()
    }

    func applicationDidBecomeActive(_ application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(_ application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
        // Saves changes in the application's managed object context before the application terminates.
        self.saveContext()
    }

    // MARK: - Core Data stack

    lazy var persistentContainer: NSPersistentContainer = {
        /*
         The persistent container for the application. This implementation
         creates and returns a container, having loaded the store for the
         application to it. This property is optional since there are legitimate
         error conditions that could cause the creation of the store to fail.
        */
        let container = NSPersistentContainer(name: "XMPPClientTest")
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
                 
                /*
                 Typical reasons for an error here include:
                 * The parent directory does not exist, cannot be created, or disallows writing.
                 * The persistent store is not accessible, due to permissions or data protection when the device is locked.
                 * The device is out of space.
                 * The store could not be migrated to the current model version.
                 Check the error message to determine what the actual problem was.
                 */
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        return container
    }()

    // MARK: - Core Data Saving support

    func saveContext () {
        let context = persistentContainer.viewContext
        if context.hasChanges {
            do {
                try context.save()
            } catch {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
                let nserror = error as NSError
                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
            }
        }
    }

}

MyClient.swift

//
//  MyClient.swift
//  XMPPClientTest
//
//  Created by Mickaël Rémond on 24/10/2018.
//  Copyright © 2018 ProcessOne. All rights reserved.
//

import XMPP

class MyClient {
    
    public var client: XMPP?
    
    init(jid: String, token: String? = nil) {
        guard let jid = JID(jid) else { print("Invalid JID"); return }
        
        var xmppConfig = Config(jid: jid, password: "mypass", useTLS: true)
        // xmppConfig.debug = true
        xmppConfig.allowInsecure = true
        xmppConfig.host = "MacBook-Pro-de-Mickael.local"
        
        if let t = token {
            xmppConfig.pushToken = t
        }
        xmppConfig.streamObserver = DefaultStreamObserver()
        
        client = XMPP(config: xmppConfig)
        client?.delegate = self
        client?.connect()
    }
}

// Handle XMPP events
extension MyClient: XMPPDelegate {
    func onStanza(_ stanza: Stanza) {
        print("Received XMPP Stanza: \(stanza)")
        if let to = JID(local: "test", server: "localhost") {
            let m = Message(type: .chat, to: to, body: "Hello")
            do {
                try client?.send(m)
            } catch let error {
                print("Could not send message: \(error)")
            }
        }
    }
    
    func onConnectionUpdate(_ newState: State) {
        switch newState {
        case .connected(let jid):
            print("Session opened for \(jid)")
        case .failed(let error):
            switch error {
            case .network(let error):
                print("Could not connect on server: \(error)")
            case .session(let error):
                print("Session establishment failed: \(error)")
            }
        default:
            print("New State is \(newState)")
        }
    }
}